<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="url"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :accept="accept"
      ref="upload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-remove="handleRemove"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="true"
      :headers="headers"
      class="upload-file-uploader"
      :drag="drag"
      :http-request="customUpload"
      :list-type="listType"
    >
      <!-- 上传按钮 -->
      <el-button v-show="!drag" size="small" type="primary">选取文件</el-button>
      <!-- 拖拽上传区域 -->
      <i v-show="drag" class="el-icon-upload" />
      <div v-show="drag" class="el-upload__text" style="padding: 0 10px">
        将文件拖到此处，或<em>点击上传</em>
      </div>
      <slot />
      <!-- 上传提示 -->
      <div v-if="showTip" slot="tip" class="el-upload__tip">
        请上传
        <template v-if="fileSize">
          大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
        </template>
        <template v-if="fileType">
          格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
        </template>
        的文件
      </div>
    </el-upload>
    <loadCom :load-target="load" :tips="'上传中'" />
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import { putOssTempUrl } from '@/api/oss'
import loadCom from '@/components/Load'
export default {
  name: 'FileUpload',
  components: {
    loadCom
  },
  props: {
    value: [String, Object, Array],
    limit: {
      type: Number,
      default: 5
    },
    fileSize: {
      type: Number,
      default: 1024
    },
    fileType: {
      type: Array,
      default: () => []
    },
    url: {
      type: String,
      default: process.env.VUE_APP_BASE_API + ''
    },
    isShowTip: {
      type: Boolean,
      default: true
    },
    accept: {
      type: String,
      default: ''
    },
    drag: {
      type: Boolean,
      default: true
    },
    // 新增动态参数
    dynamicHeaders: {
      type: Object,
      default: () => ({})
    },
    dynamicMethod: {
      type: String,
      default: 'POST'
    },
    dynamicUrl: {
      type: String,
      default: null
    },
    ossId: {
      type: [Number, String],
      default: ''
    },
    listType: {
      type: String,
      default: 'text'
    },
    // 单页面多次引用区别是谁
    who: {
      type: String,
      default: '',
      required: false
    },
    // 循环套用时候需要传入应用对象
    applyTarget: {
      type: Object,
      default: null,
      required: false
    }
  },
  data() {
    return {
      baseUrl: process.env.VUE_APP_BASE_API,
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      fileList: [],
      uploadFile: null,
      load: false
    }
  },
  computed: {
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // console.log("文件列表:", val);
          let list = []
          if (Array.isArray(val)) {
            list = val
          } else if (typeof val === 'object' && Object.keys(val).length > 0) {
            list = [val]
          } else if (typeof val === 'string') {
            if (val.includes(',')) {
              list = val.split(',').filter((item) => item.trim())
            } else {
              list = [val]
            }
          }
          // const list = Array.isArray(val) ? val : this.value.split(",");
          this.fileList = list.map((item) => {
            if (typeof item === 'string') {
              item = { name: item, url: item }
            }
            // item.uid = item.uid || new Date().getTime() + temp++;
            return item
          })
        } else {
          this.fileList = []
        }
      },
      deep: true,
      immediate: true
    }
  },
  created() {
    document.body.ondrop = function(event) {
      event.preventDefault()
      event.stopPropagation()
    }
  },
  methods: {
    handleBeforeUpload(file) {
      // 根据获取的文件file的name属性的后缀名，判断是否是限制类型的文件
      if (this.fileType.length > 0) {
        const fileExtension = file.name.split('.').pop().toLowerCase()
        if (!this.fileType.includes(fileExtension)) {
          this.$message({
            message: '非限制类型文件，请重新选择',
            type: 'warning'
          })
          return false
        }
      }
      // 判断文件大小是否超过限制
      if (file.size > this.fileSize * 1024 * 1024) {
        this.$message({
          message: '文件大小不能超过 ' + this.fileSize + 'MB',
          type: 'warning'
        })
        return false
      }
      this.getWandH(file)
      // 获取文件类型
      const fileType = file.type
      // 将文件类型传递给父组件
      this.$emit('giveMediaType', fileType, this.who, this.applyTarget)
      this.load = true
      // 等待父组件设置动态参数
      return new Promise((resolve) => {
        // 等待动态参数设置完成
        const checkDynamicParams = () => {
          if (this.dynamicUrl && this.dynamicHeaders && this.dynamicMethod) {
            resolve(true)
          } else {
            setTimeout(checkDynamicParams, 100)
          }
        }
        checkDynamicParams()
      })
    },
    getWandH(file) {
      // 如果是图片类型，获取图片的宽和高
      if (file.type.startsWith('image/') && this.listType === 'picture') {
        const reader = new FileReader()
        reader.onload = (e) => {
          const img = new Image()
          img.onload = () => {
            const width = img.width
            const height = img.height
            // 将图片宽高信息传递给父组件
            this.$emit('getImageDimensions', { width: width, height: height })
          }
          img.src = e.target.result
        }
        reader.readAsDataURL(file)
      }
    },
    requeseputOssTempUrl(options) {
      // console.log(this.ossId, 112323);
      if (
        this.ossId &&
        (typeof this.ossId === 'number' || typeof this.ossId === 'string')
      ) {
        putOssTempUrl(this.ossId)
          .then((res) => {
            this.load = false
            if (res.success) {
              // 触发 on-success 事件
              options.onSuccess(res.data)
            }
          })
          .catch((err) => { })
      }
    },
    customUpload(options) {
      this.uploadFile = options.file
      // console.log("上传文件:", this.uploadFile);
      // 发起请求
      this.$http
        .request({
          method: this.dynamicMethod,
          url: this.dynamicUrl,
          data: this.uploadFile,
          headers: {
            ...this.dynamicHeaders
          }
        })
        .then((response) => {
          this.requeseputOssTempUrl(options)
        })
        .catch((error) => {
          // 触发 on-error 事件
          options.onError(error)
          this.$message.error('上传文件失败，请重试')
        })
    },
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    handleUploadError(err) {
      this.load = false
      this.$message.error('上传文件失败，请重试')
    },
    handleUploadSuccess(data) {
      const obj = {
        name: this.uploadFile.name,
        url: data.url,
        ossId: this.ossId
      }
      this.fileList.push(obj)
      this.$emit('input', this.fileList, this.who, this.applyTarget)
    },
    handleRemove(file, fileList) {
      // 移除文件时要把对应的父组件的form.file和imageOidList中的值也删除掉
      this.$emit('deleteFile', file, this.who, this.applyTarget)
    },
    // 当外层的动态参数获取失败，则需要手动将刚刚准备上传（还没有上传成功的）的文件从列表中移除
    handleCleanadd() {
      // 过滤掉没有ossId或url的文件（即未成功上传的文件）
      this.fileList = this.fileList.filter((file) => file.ossId || file.url)
      // 触发input事件通知父组件更新
      this.$emit('input', this.fileList, this.who)
    }
    // getFileName(name) {
    //   if (name.lastIndexOf("/") > -1) {
    //     return name.slice(name.lastIndexOf("/") + 1);
    //   } else {
    //     return "";
    //   }
    // },
    // listToString(list, separator) {
    //   let strs = "";
    //   separator = separator || ",";
    //   for (let i in list) {
    //     strs += list[i].url + separator;
    //   }
    //   return strs != "" ? strs.substr(0, strs.length - 1) : "";
    // },
  }
}
</script>

<style scoped lang="scss">
::v-deep .el-upload-dragger {
  width: auto;
  height: auto;
}

.upload-file-uploader {
  margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}

.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
</style>
